One type of this substance corresponds to the continuous, or rightmost, branch of Bowen's reaction series; another type is polymorphous with microcline and sanidine. Three types of this non-quartz material are used in the QAPF diagram to classify other substances. One variety has [*] sodium or calcium in its chemical formula, while another contains potassium and is a 6 on the Mohs scale; those varieties are plagioclase and orthoclase. For 10 points, name this class of aluminum silicate minerals,
One type of this substance corresponds to the continuous, or rightmost, branch of Bowen's reaction series; another type is polymorphous with microcline and sanidine. Three types of this non-quartz material are used in the QAPF diagram to classify other substances. One variety has [*] sodium or calcium in its chemical formula, while another contains potassium and is a 6 on the Mohs scale; those varieties are plagioclase and orthoclase. For 10 points, name this class of aluminum silicate minerals, which make up about 60% of the earth's crust.
One type of this substance corresponds to the continuous, or rightmost, branch of Bowen's reaction series; another type is polymorphous with microcline and sanidine.
{feldspar} [accept {plagioclase feldspar} until “{another type}” is read]